Dilworth is best known for being the leading manager of Room 5600, known now as Rockefeller Family & Associates, the family office of the Rockefeller family, situated on the 54-56th floors of the GE Building, 30 Rockefeller Plaza, in Rockefeller Center.
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In 1974 he came into public prominence when he appeared before the United States Congress during the confirmation hearings for Nelson Rockefeller's nomination by Gerald Ford for the vice-presidency; during his presentation to Congressmen he outlined the overall wealth of Nelson's family.
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In his service for the six-generation dynastic clan, Dilworth served up until 1982 as the chair of the company that previously owned Rockefeller Center, Rockefeller Center Inc. (RCI), which is now the Rockefeller Group.
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